зеркало из https://github.com/mozilla/gecko-dev.git
776 строки
25 KiB
C++
776 строки
25 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public License
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* Version 1.0 (the "NPL") you may not use this file except in
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* compliance with the NPL. You may obtain a copy of the NPL at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the NPL is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
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* for the specific language governing rights and limitations under the
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* NPL.
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*
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* The Initial Developer of this code under the NPL is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All Rights
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* Reserved.
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*/
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#include "nsTextEditRules.h"
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#include "nsTextEditor.h"
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#include "PlaceholderTxn.h"
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#include "InsertTextTxn.h"
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#include "nsCOMPtr.h"
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#include "nsIDOMNode.h"
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#include "nsIDOMElement.h"
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#include "nsIDOMNodeList.h"
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#include "nsIDOMSelection.h"
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#include "nsIDOMRange.h"
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#include "nsIDOMCharacterData.h"
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#include "nsIEnumerator.h"
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#include "nsIContent.h"
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#include "nsIEditProperty.h"
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const static char* kMOZEditorBogusNodeAttr="MOZ_EDITOR_BOGUS_NODE";
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const static char* kMOZEditorBogusNodeValue="TRUE";
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static NS_DEFINE_IID(kPlaceholderTxnIID, PLACEHOLDER_TXN_IID);
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/********************************************************
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* Helper Functions
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********************************************************/
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PRBool nsTextEditRules::NodeIsType(nsIDOMNode *aNode, nsIAtom *aTag)
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{
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nsCOMPtr<nsIDOMElement>element;
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element = do_QueryInterface(aNode);
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if (element)
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{
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nsAutoString tag;
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element->GetTagName(tag);
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if (tag.Equals(aTag->GetUnicode()))
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{
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return PR_TRUE;
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}
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}
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return PR_FALSE;
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}
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PRBool nsTextEditRules::IsEditable(nsIDOMNode *aNode)
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{
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if (!aNode) return PR_FALSE;
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nsCOMPtr<nsIDOMElement>element;
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element = do_QueryInterface(aNode);
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if (element)
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{
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nsAutoString att(kMOZEditorBogusNodeAttr);
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nsAutoString val;
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(void)element->GetAttribute(att, val);
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if (val.Equals(kMOZEditorBogusNodeValue)) {
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return PR_FALSE;
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}
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else {
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return PR_TRUE;
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}
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}
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else
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{
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nsCOMPtr<nsIDOMCharacterData>text;
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text = do_QueryInterface(aNode);
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if (text)
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{
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nsAutoString data;
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text->GetData(data);
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if (0==data.Length()) {
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return PR_FALSE;
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}
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if ('\n'==data.CharAt(0)) {
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return PR_FALSE;
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}
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else {
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return PR_TRUE;
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}
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}
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}
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return PR_TRUE;
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}
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/********************************************************
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* Constructor/Destructor
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********************************************************/
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nsTextEditRules::nsTextEditRules()
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{
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mEditor = nsnull;
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}
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nsTextEditRules::~nsTextEditRules()
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{
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// do NOT delete mEditor here. We do not hold a ref count to mEditor. mEditor owns our lifespan.
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}
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/********************************************************
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* Public methods
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********************************************************/
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NS_IMETHODIMP
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nsTextEditRules::Init(nsIEditor *aEditor)
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{
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// null aNextRule is ok
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if (!aEditor) { return NS_ERROR_NULL_POINTER; }
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mEditor = (nsTextEditor*)aEditor; // we hold a non-refcounted reference back to our editor
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return NS_OK;
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}
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NS_IMETHODIMP
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nsTextEditRules::WillDoAction(nsIDOMSelection *aSelection,
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nsRulesInfo *aInfo, PRBool *aCancel)
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{
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if (!aSelection || !aInfo)
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return NS_ERROR_NULL_POINTER;
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// my kingdom for dynamic cast
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nsTextRulesInfo *info = NS_STATIC_CAST(nsTextRulesInfo*, aInfo);
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switch (info->action)
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{
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case kInsertText:
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return WillInsertText(aSelection,
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aCancel,
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info->placeTxn,
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info->inString,
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info->outString,
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info->typeInState);
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case kDeleteSelection:
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return WillDeleteSelection(aSelection, aCancel);
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case kUndo:
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return WillUndo(aSelection, aCancel);
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case kRedo:
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return WillRedo(aSelection, aCancel);
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}
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return NS_ERROR_FAILURE;
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}
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NS_IMETHODIMP
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nsTextEditRules::DidDoAction(nsIDOMSelection *aSelection,
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nsRulesInfo *aInfo, nsresult aResult)
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{
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if (!aSelection || !aInfo)
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return NS_ERROR_NULL_POINTER;
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// my kingdom for dynamic cast
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nsTextRulesInfo *info = NS_STATIC_CAST(nsTextRulesInfo*, aInfo);
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switch (info->action)
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{
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case kInsertText:
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return DidInsertText(aSelection, aResult);
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case kDeleteSelection:
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return DidDeleteSelection(aSelection, aResult);
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case kUndo:
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return DidUndo(aSelection, aResult);
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case kRedo:
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return DidRedo(aSelection, aResult);
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}
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return NS_ERROR_FAILURE;
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}
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/********************************************************
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* Protected methods
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********************************************************/
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nsresult
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nsTextEditRules::WillInsert(nsIDOMSelection *aSelection, PRBool *aCancel)
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{
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if (!aSelection || !aCancel) { return NS_ERROR_NULL_POINTER; }
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// initialize out param
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*aCancel = PR_FALSE;
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// check for the magic content node and delete it if it exists
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if (mBogusNode)
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{
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mEditor->DeleteNode(mBogusNode);
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mBogusNode = do_QueryInterface(nsnull);
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// there is no longer any legit selection, so clear it.
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aSelection->ClearSelection();
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}
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return NS_OK;
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}
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nsresult
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nsTextEditRules::DidInsert(nsIDOMSelection *aSelection, nsresult aResult)
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{
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return NS_OK;
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}
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nsresult
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nsTextEditRules::WillInsertText(nsIDOMSelection *aSelection,
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PRBool *aCancel,
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PlaceholderTxn **aTxn,
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const nsString *inString,
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nsString *outString,
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TypeInState typeInState)
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{
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if (!aSelection || !aCancel || !inString || !outString)
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return NS_ERROR_NULL_POINTER;
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// initialize out params
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*aCancel = PR_FALSE;
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*outString = *inString;
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if (mBogusNode || (PR_TRUE==typeInState.IsAnySet()))
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{
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nsresult result = TransactionFactory::GetNewTransaction(kPlaceholderTxnIID, (EditTxn **)aTxn);
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if (NS_FAILED(result)) { return result; }
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if (!*aTxn) { return NS_ERROR_NULL_POINTER; }
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(*aTxn)->SetName(InsertTextTxn::gInsertTextTxnName);
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mEditor->Do(*aTxn);
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}
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nsresult result = WillInsert(aSelection, aCancel);
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if (NS_SUCCEEDED(result) && (PR_FALSE==*aCancel))
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{
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if (PR_TRUE==typeInState.IsAnySet())
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{ // for every property that is set, insert a new inline style node
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result = CreateStyleForInsertText(aSelection, typeInState);
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}
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}
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return result;
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}
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nsresult
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nsTextEditRules::DidInsertText(nsIDOMSelection *aSelection,
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nsresult aResult)
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{
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return DidInsert(aSelection, aResult);
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}
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nsresult
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nsTextEditRules::CreateStyleForInsertText(nsIDOMSelection *aSelection, TypeInState &aTypeInState)
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{
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// private method, we know aSelection is not null, and that it is collapsed
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NS_ASSERTION(nsnull!=aSelection, "bad selection");
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// We know at least one style is set and we're about to insert at least one character.
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// If the selection is in a text node, split the node (even if we're at the beginning or end)
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// then put the text node inside new inline style parents.
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// Otherwise, create the text node and the new inline style parents.
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nsCOMPtr<nsIDOMNode>anchor;
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PRInt32 offset;
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nsresult result = aSelection->GetAnchorNode(getter_AddRefs(anchor));
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if (NS_SUCCEEDED(result) && NS_SUCCEEDED(aSelection->GetAnchorOffset(&offset)) && anchor)
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{
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nsCOMPtr<nsIDOMCharacterData>anchorAsText;
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anchorAsText = do_QueryInterface(anchor);
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if (anchorAsText)
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{
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nsCOMPtr<nsIDOMNode>newTextNode;
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// create an empty text node by splitting the selected text node according to offset
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if (0==offset)
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{
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result = mEditor->SplitNode(anchorAsText, offset, getter_AddRefs(newTextNode));
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}
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else
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{
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PRUint32 length;
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anchorAsText->GetLength(&length);
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if (length==offset)
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{
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// newTextNode will be the left node
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result = mEditor->SplitNode(anchorAsText, offset, getter_AddRefs(newTextNode));
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// but we want the right node in this case
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newTextNode = do_QueryInterface(anchor);
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}
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else
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{
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// splitting anchor twice sets newTextNode as an empty text node between
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// two halves of the original text node
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result = mEditor->SplitNode(anchorAsText, offset, getter_AddRefs(newTextNode));
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result = mEditor->SplitNode(anchorAsText, 0, getter_AddRefs(newTextNode));
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}
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}
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// now we have the new text node we are going to insert into.
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// create style nodes or move it up the content hierarchy as needed.
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if ((NS_SUCCEEDED(result)) && newTextNode)
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{
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nsCOMPtr<nsIDOMNode>newStyleNode;
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if (aTypeInState.IsSet(NS_TYPEINSTATE_BOLD))
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{
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if (PR_TRUE==aTypeInState.GetBold()) {
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result = InsertStyleNode(newTextNode, nsIEditProperty::b, aSelection, getter_AddRefs(newStyleNode));
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}
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else {
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printf("not yet implemented, make not bold in a bold context\n");
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}
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}
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if (aTypeInState.IsSet(NS_TYPEINSTATE_ITALIC))
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{
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if (PR_TRUE==aTypeInState.GetItalic()) {
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result = InsertStyleNode(newTextNode, nsIEditProperty::i, aSelection, getter_AddRefs(newStyleNode));
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}
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else
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{
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printf("not yet implemented, make not italic in a italic context\n");
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}
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}
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if (aTypeInState.IsSet(NS_TYPEINSTATE_UNDERLINE))
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{
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if (PR_TRUE==aTypeInState.GetUnderline()) {
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result = InsertStyleNode(newTextNode, nsIEditProperty::u, aSelection, getter_AddRefs(newStyleNode));
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}
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else
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{
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printf("not yet implemented, make not underline in an underline context\n");
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}
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}
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if (aTypeInState.IsSet(NS_TYPEINSTATE_FONTCOLOR))
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{
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nsAutoString value;
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aTypeInState.GetFontColor(value);
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nsAutoString attr;
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nsIEditProperty::color->ToString(attr);
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result = CreateFontStyleForInsertText(newTextNode, attr, value, aSelection);
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}
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if (aTypeInState.IsSet(NS_TYPEINSTATE_FONTFACE))
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{
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nsAutoString value;
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aTypeInState.GetFontFace(value);
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nsAutoString attr;
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nsIEditProperty::face->ToString(attr);
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result = CreateFontStyleForInsertText(newTextNode, attr, value, aSelection);
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}
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if (aTypeInState.IsSet(NS_TYPEINSTATE_FONTSIZE))
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{
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nsAutoString value;
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aTypeInState.GetFontSize(value);
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nsAutoString attr;
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nsIEditProperty::size->ToString(attr);
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result = CreateFontStyleForInsertText(newTextNode, attr, value, aSelection);
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}
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}
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}
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else
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{
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printf("not yet implemented. selection is not text.\n");
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}
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}
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else // we have no selection, so insert a style tag in the body
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{
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nsCOMPtr<nsIDOMDocument>doc;
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mEditor->GetDocument(getter_AddRefs(doc));
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nsCOMPtr<nsIDOMNodeList>nodeList;
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nsAutoString bodyTag = "body";
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nsresult result = doc->GetElementsByTagName(bodyTag, getter_AddRefs(nodeList));
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if ((NS_SUCCEEDED(result)) && nodeList)
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{
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PRUint32 count;
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nodeList->GetLength(&count);
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NS_ASSERTION(1==count, "there is not exactly 1 body in the document!");
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nsCOMPtr<nsIDOMNode>bodyNode;
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result = nodeList->Item(0, getter_AddRefs(bodyNode));
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if ((NS_SUCCEEDED(result)) && bodyNode)
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{ // now we've got the body tag. insert the style tag
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if (aTypeInState.IsSet(NS_TYPEINSTATE_BOLD))
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{
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if (PR_TRUE==aTypeInState.GetBold()) {
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InsertStyleAndNewTextNode(bodyNode, nsIEditProperty::b, aSelection);
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}
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}
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if (aTypeInState.IsSet(NS_TYPEINSTATE_ITALIC))
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{
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if (PR_TRUE==aTypeInState.GetItalic()) {
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InsertStyleAndNewTextNode(bodyNode, nsIEditProperty::i, aSelection);
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}
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}
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if (aTypeInState.IsSet(NS_TYPEINSTATE_UNDERLINE))
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{
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if (PR_TRUE==aTypeInState.GetUnderline()) {
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InsertStyleAndNewTextNode(bodyNode, nsIEditProperty::u, aSelection);
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}
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}
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}
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}
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}
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return result;
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}
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nsresult
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nsTextEditRules::CreateFontStyleForInsertText(nsIDOMNode *aNewTextNode,
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const nsString &aAttr,
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const nsString &aValue,
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nsIDOMSelection *aSelection)
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{
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nsresult result = NS_OK;
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nsCOMPtr<nsIDOMNode>newStyleNode;
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if (0!=aValue.Length())
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{
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result = InsertStyleNode(aNewTextNode, nsIEditProperty::font, aSelection, getter_AddRefs(newStyleNode));
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if (NS_SUCCEEDED(result) && newStyleNode)
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{
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nsCOMPtr<nsIDOMElement>element = do_QueryInterface(newStyleNode);
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if (element) {
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result = mEditor->SetAttribute(element, aAttr, aValue);
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}
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}
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}
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else
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{
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printf("not yet implemented, undo font in an font context\n");
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}
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return result;
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}
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nsresult
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nsTextEditRules::InsertStyleNode(nsIDOMNode *aNode,
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nsIAtom *aTag,
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nsIDOMSelection *aSelection,
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nsIDOMNode **aNewNode)
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{
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NS_ASSERTION(aNode && aTag, "bad args");
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if (!aNode || !aTag) { return NS_ERROR_NULL_POINTER; }
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nsresult result;
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nsCOMPtr<nsIDOMNode>parent;
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aNode->GetParentNode(getter_AddRefs(parent));
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PRInt32 offsetInParent;
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nsIEditorSupport::GetChildOffset(aNode, parent, offsetInParent);
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nsAutoString tag;
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aTag->ToString(tag);
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result = mEditor->CreateNode(tag, parent, offsetInParent, aNewNode);
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if ((NS_SUCCEEDED(result)) && *aNewNode)
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{
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result = mEditor->DeleteNode(aNode);
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if (NS_SUCCEEDED(result))
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{
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result = mEditor->InsertNode(aNode, *aNewNode, 0);
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if (NS_SUCCEEDED(result)) {
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if (aSelection) {
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aSelection->Collapse(aNode, 0);
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}
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}
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}
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}
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return result;
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}
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nsresult
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nsTextEditRules::InsertStyleAndNewTextNode(nsIDOMNode *aParentNode, nsIAtom *aTag, nsIDOMSelection *aSelection)
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{
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NS_ASSERTION(aParentNode && aTag, "bad args");
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if (!aParentNode || !aTag) { return NS_ERROR_NULL_POINTER; }
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nsresult result;
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// if the selection already points to a text node, just call InsertStyleNode()
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if (aSelection)
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{
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nsCOMPtr<nsIDOMNode>anchor;
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PRInt32 offset;
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nsresult result = aSelection->GetAnchorNode(getter_AddRefs(anchor));
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if (NS_SUCCEEDED(result) && NS_SUCCEEDED(aSelection->GetAnchorOffset(&offset)) && anchor)
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{
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nsCOMPtr<nsIDOMCharacterData>anchorAsText;
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anchorAsText = do_QueryInterface(anchor);
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if (anchorAsText)
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{
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nsCOMPtr<nsIDOMNode> newStyleNode;
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result = InsertStyleNode(anchor, aTag, aSelection, getter_AddRefs(newStyleNode));
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return result;
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}
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}
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}
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// if we get here, there is no selected text node so we create one.
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nsAutoString tag;
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aTag->ToString(tag);
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nsCOMPtr<nsIDOMNode>newStyleNode;
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nsCOMPtr<nsIDOMNode>newTextNode;
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result = mEditor->CreateNode(tag, aParentNode, 0, getter_AddRefs(newStyleNode));
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if (NS_SUCCEEDED(result))
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{
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result = mEditor->CreateNode(nsIEditor::GetTextNodeTag(), newStyleNode, 0, getter_AddRefs(newTextNode));
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if (NS_SUCCEEDED(result))
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{
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if (aSelection) {
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aSelection->Collapse(newTextNode, 0);
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}
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}
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}
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return result;
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}
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/*
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nsresult
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nsTextEditRules::GetInsertBreakTag(nsIAtom **aTag)
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{
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if (!aTag) { return NS_ERROR_NULL_POINTER; }
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*aTag = NS_NewAtom("BR");
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return NS_OK;
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}
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*/
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nsresult
|
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nsTextEditRules::WillDeleteSelection(nsIDOMSelection *aSelection, PRBool *aCancel)
|
|
{
|
|
if (!aSelection || !aCancel) { return NS_ERROR_NULL_POINTER; }
|
|
// initialize out param
|
|
*aCancel = PR_FALSE;
|
|
|
|
// if there is only bogus content, cancel the operation
|
|
if (mBogusNode) {
|
|
*aCancel = PR_TRUE;
|
|
return NS_OK;
|
|
}
|
|
return NS_OK;
|
|
}
|
|
|
|
// if the document is empty, insert a bogus text node with a
|
|
// if we ended up with consecutive text nodes, merge them
|
|
nsresult
|
|
nsTextEditRules::DidDeleteSelection(nsIDOMSelection *aSelection, nsresult aResult)
|
|
{
|
|
nsresult result = aResult; // if aResult is an error, we just return it
|
|
if (!aSelection) { return NS_ERROR_NULL_POINTER; }
|
|
PRBool isCollapsed;
|
|
aSelection->GetIsCollapsed(&isCollapsed);
|
|
NS_ASSERTION(PR_TRUE==isCollapsed, "selection not collapsed after delete selection.");
|
|
// if the delete selection resulted in no content
|
|
// insert a special bogus text node with a character in it.
|
|
if (NS_SUCCEEDED(result)) // only do this work if DeleteSelection completed successfully
|
|
{
|
|
nsCOMPtr<nsIDOMDocument>doc;
|
|
mEditor->GetDocument(getter_AddRefs(doc));
|
|
nsCOMPtr<nsIDOMNodeList>nodeList;
|
|
nsAutoString bodyTag = "body";
|
|
nsresult result = doc->GetElementsByTagName(bodyTag, getter_AddRefs(nodeList));
|
|
if ((NS_SUCCEEDED(result)) && nodeList)
|
|
{
|
|
PRUint32 count;
|
|
nodeList->GetLength(&count);
|
|
NS_ASSERTION(1==count, "there is not exactly 1 body in the document!");
|
|
nsCOMPtr<nsIDOMNode>bodyNode;
|
|
result = nodeList->Item(0, getter_AddRefs(bodyNode));
|
|
if ((NS_SUCCEEDED(result)) && bodyNode)
|
|
{ // now we've got the body tag.
|
|
// iterate the body tag, looking for editable content
|
|
// if no editable content is found, insert the bogus node
|
|
PRBool needsBogusContent=PR_TRUE;
|
|
nsCOMPtr<nsIDOMNode>bodyChild;
|
|
result = bodyNode->GetFirstChild(getter_AddRefs(bodyChild));
|
|
while ((NS_SUCCEEDED(result)) && bodyChild)
|
|
{
|
|
if (PR_TRUE==IsEditable(bodyChild))
|
|
{
|
|
needsBogusContent = PR_FALSE;
|
|
break;
|
|
}
|
|
nsCOMPtr<nsIDOMNode>temp;
|
|
bodyChild->GetNextSibling(getter_AddRefs(temp));
|
|
bodyChild = do_QueryInterface(temp);
|
|
}
|
|
if (PR_TRUE==needsBogusContent)
|
|
{
|
|
// set mBogusNode to be the newly created <P>
|
|
result = mEditor->CreateNode(nsAutoString("P"), bodyNode, 0,
|
|
getter_AddRefs(mBogusNode));
|
|
if ((NS_SUCCEEDED(result)) && mBogusNode)
|
|
{
|
|
nsCOMPtr<nsIDOMNode>newTNode;
|
|
result = mEditor->CreateNode(nsIEditor::GetTextNodeTag(), mBogusNode, 0,
|
|
getter_AddRefs(newTNode));
|
|
if ((NS_SUCCEEDED(result)) && newTNode)
|
|
{
|
|
nsCOMPtr<nsIDOMCharacterData>newNodeAsText;
|
|
newNodeAsText = do_QueryInterface(newTNode);
|
|
if (newNodeAsText)
|
|
{
|
|
nsAutoString data;
|
|
data += 160;
|
|
newNodeAsText->SetData(data);
|
|
aSelection->Collapse(newTNode, 0);
|
|
}
|
|
}
|
|
// make sure we know the PNode is bogus
|
|
nsCOMPtr<nsIDOMElement>newPElement;
|
|
newPElement = do_QueryInterface(mBogusNode);
|
|
if (newPElement)
|
|
{
|
|
nsAutoString att(kMOZEditorBogusNodeAttr);
|
|
nsAutoString val(kMOZEditorBogusNodeValue);
|
|
newPElement->SetAttribute(att, val);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
// if we don't have an empty document, check the selection to see if any collapsing is necessary
|
|
if (!mBogusNode)
|
|
{
|
|
nsCOMPtr<nsIDOMNode>anchor;
|
|
PRInt32 offset;
|
|
nsresult result = aSelection->GetAnchorNode(getter_AddRefs(anchor));
|
|
if (NS_SUCCEEDED(result) && NS_SUCCEEDED(aSelection->GetAnchorOffset(&offset)) && anchor)
|
|
{
|
|
nsCOMPtr<nsIDOMNodeList> anchorChildren;
|
|
result = anchor->GetChildNodes(getter_AddRefs(anchorChildren));
|
|
nsCOMPtr<nsIDOMNode> selectedNode;
|
|
if ((NS_SUCCEEDED(result)) && anchorChildren) {
|
|
result = anchorChildren->Item(offset, getter_AddRefs(selectedNode));
|
|
}
|
|
else {
|
|
selectedNode = do_QueryInterface(anchor);
|
|
}
|
|
if ((NS_SUCCEEDED(result)) && selectedNode)
|
|
{
|
|
nsCOMPtr<nsIDOMCharacterData>selectedNodeAsText;
|
|
selectedNodeAsText = do_QueryInterface(selectedNode);
|
|
if (selectedNodeAsText)
|
|
{
|
|
nsCOMPtr<nsIDOMNode> siblingNode;
|
|
selectedNode->GetPreviousSibling(getter_AddRefs(siblingNode));
|
|
if (siblingNode)
|
|
{
|
|
nsCOMPtr<nsIDOMCharacterData>siblingNodeAsText;
|
|
siblingNodeAsText = do_QueryInterface(siblingNode);
|
|
if (siblingNodeAsText)
|
|
{
|
|
PRUint32 siblingLength; // the length of siblingNode before the join
|
|
siblingNodeAsText->GetLength(&siblingLength);
|
|
nsCOMPtr<nsIDOMNode> parentNode;
|
|
selectedNode->GetParentNode(getter_AddRefs(parentNode));
|
|
result = mEditor->JoinNodes(siblingNode, selectedNode, parentNode);
|
|
// selectedNode will remain after the join, siblingNode is removed
|
|
}
|
|
}
|
|
selectedNode->GetNextSibling(getter_AddRefs(siblingNode));
|
|
if (siblingNode)
|
|
{
|
|
nsCOMPtr<nsIDOMCharacterData>siblingNodeAsText;
|
|
siblingNodeAsText = do_QueryInterface(siblingNode);
|
|
if (siblingNodeAsText)
|
|
{
|
|
PRUint32 selectedNodeLength; // the length of siblingNode before the join
|
|
selectedNodeAsText->GetLength(&selectedNodeLength);
|
|
nsCOMPtr<nsIDOMNode> parentNode;
|
|
selectedNode->GetParentNode(getter_AddRefs(parentNode));
|
|
result = mEditor->JoinNodes(selectedNode, siblingNode, parentNode);
|
|
// selectedNode will remain after the join, siblingNode is removed
|
|
// set selection
|
|
aSelection->Collapse(siblingNode, selectedNodeLength);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
nsresult
|
|
nsTextEditRules::WillUndo(nsIDOMSelection *aSelection, PRBool *aCancel)
|
|
{
|
|
if (!aSelection || !aCancel) { return NS_ERROR_NULL_POINTER; }
|
|
// initialize out param
|
|
*aCancel = PR_FALSE;
|
|
return NS_OK;
|
|
}
|
|
|
|
/* the idea here is to see if the magic empty node has suddenly reappeared as the result of the undo.
|
|
* if it has, set our state so we remember it.
|
|
* There is a tradeoff between doing here and at redo, or doing it everywhere else that might care.
|
|
* Since undo and redo are relatively rare, it makes sense to take the (small) performance hit here.
|
|
*/
|
|
nsresult
|
|
nsTextEditRules:: DidUndo(nsIDOMSelection *aSelection, nsresult aResult)
|
|
{
|
|
nsresult result = aResult; // if aResult is an error, we return it.
|
|
if (!aSelection) { return NS_ERROR_NULL_POINTER; }
|
|
if (NS_SUCCEEDED(result))
|
|
{
|
|
if (mBogusNode) {
|
|
mBogusNode = do_QueryInterface(nsnull);
|
|
}
|
|
else
|
|
{
|
|
nsCOMPtr<nsIDOMNode>node;
|
|
PRInt32 offset;
|
|
nsresult result = aSelection->GetAnchorNode(getter_AddRefs(node));
|
|
if (NS_SUCCEEDED(result) && NS_SUCCEEDED(aSelection->GetAnchorOffset(&offset)) && node)
|
|
{
|
|
nsCOMPtr<nsIDOMElement>element;
|
|
element = do_QueryInterface(node);
|
|
if (element)
|
|
{
|
|
nsAutoString att(kMOZEditorBogusNodeAttr);
|
|
nsAutoString val;
|
|
(void)element->GetAttribute(att, val);
|
|
if (val.Equals(kMOZEditorBogusNodeValue)) {
|
|
mBogusNode = do_QueryInterface(element);
|
|
}
|
|
}
|
|
nsCOMPtr<nsIDOMNode> temp;
|
|
result = node->GetParentNode(getter_AddRefs(temp));
|
|
node = do_QueryInterface(temp);
|
|
}
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
nsresult
|
|
nsTextEditRules::WillRedo(nsIDOMSelection *aSelection, PRBool *aCancel)
|
|
{
|
|
if (!aSelection || !aCancel) { return NS_ERROR_NULL_POINTER; }
|
|
// initialize out param
|
|
*aCancel = PR_FALSE;
|
|
return NS_OK;
|
|
}
|
|
|
|
nsresult
|
|
nsTextEditRules::DidRedo(nsIDOMSelection *aSelection, nsresult aResult)
|
|
{
|
|
nsresult result = aResult; // if aResult is an error, we return it.
|
|
if (!aSelection) { return NS_ERROR_NULL_POINTER; }
|
|
if (NS_SUCCEEDED(result))
|
|
{
|
|
if (mBogusNode) {
|
|
mBogusNode = do_QueryInterface(nsnull);
|
|
}
|
|
else
|
|
{
|
|
nsCOMPtr<nsIDOMNode>node;
|
|
PRInt32 offset;
|
|
nsresult result = aSelection->GetAnchorNode(getter_AddRefs(node));
|
|
if (NS_SUCCEEDED(result) && NS_SUCCEEDED(aSelection->GetAnchorOffset(&offset)) && node)
|
|
{
|
|
nsCOMPtr<nsIDOMElement>element;
|
|
element = do_QueryInterface(node);
|
|
if (element)
|
|
{
|
|
nsAutoString att(kMOZEditorBogusNodeAttr);
|
|
nsAutoString val;
|
|
(void)element->GetAttribute(att, val);
|
|
if (val.Equals(kMOZEditorBogusNodeValue)) {
|
|
mBogusNode = do_QueryInterface(element);
|
|
}
|
|
}
|
|
nsCOMPtr<nsIDOMNode> temp;
|
|
result = node->GetParentNode(getter_AddRefs(temp));
|
|
node = do_QueryInterface(temp);
|
|
}
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|